Autococker Hammers

So I have some questions about my newly acquired (used) autococker sr. When I tried to adjust the lug depth, it was near close to impossible. I could move the lug. So, I took off the trigger frame and had a look at the underside. I noticed that on the underside the lug/hammer had cracked. At least I think it did. So my questions are:
1. (It may sound stupid) Does the lug screw in fact screw into the hammer.
2. Can I replace the hammer with any other autococker hammer (aka from a trilly or prostock) if it is indeed broken.